Perhaps the guy really isn't an emotionless robot built entirely of ego -- and, now that his self-defense instinct has exhausted itself, his urge to stop lying, express some entirely authentic and long-suppressed remorse, and save his wife's family and his own children from a lifetime of uncertainty has finally won out.

(For further insight into this aspect of the human psyche I recommend Dostoyevsky's Crime and Punishment.)

Or, perhaps he's an emotionless robot playing the role of a remorseful human being. If so, I think it's about time. It's not as if Plan A was working out well for anyone.

Requiescat in Pace